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Method for connecting members together and connection structure

a technology of connecting members and connecting structures, applied in the direction of manufacturing tools, mechanical devices, fastening means, etc., can solve the problems of long adhesion time, increased production time, and variable problems, and achieve the effect of high connection strength

Inactive Publication Date: 2014-12-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for connecting fiber reinforced resin members together using high-level connection strength over the entire range of the connection portion. The method involves pressing the members together while heat is applied using either induction heating or dielectric heating. This results in the formation of a connection structure that is easy to create in a short time.

Problems solved by technology

The aforementioned connection methods that have been used so far for connection of so-called similar members together, such as connection of fiber reinforced resin members together or connection of metal members together, or for connection of so-called dissimilar members together, such as connection of a fiber reinforced resin member and a metal member together, have various problems.
Specifically, there are problems in that when an adhesive is used, it takes a long time for adhesion, and when a bolt, screwing, self-piercing riveting, or the like is used, a connecting part is necessary; thus, the production time would increase or the production cost associated with the connecting part would increase.
In particular, when members with three-dimensionally complicated shapes are connected together using a connecting part such as a bolt, it would be not easy to handle alignment between the members to be connected together, and thus, complicated assembly procedures would be needed to connect the members together using the connecting part.
Meanwhile, when a connection method using adhesion or welding is used, it is easily understood that it is quite difficult to uniformly apply an adhesive to or uniformly apply heat to all of the portions to be connected that are three-dimensionally complicated (at a position of superposition) as soon as possible.
However, since heating is conducted in the air, heat transfer efficiency is low and it thus takes a long time to join the members together through heating.
Thus, the aforementioned problem cannot be solved.
Further, even when such a connection method is used, it is still quite difficult to uniformly apply heat to all of the portions to be connected that have three-dimensionally complicated shapes (at a position of superposition) as soon as possible.

Method used

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  • Method for connecting members together and connection structure
  • Method for connecting members together and connection structure
  • Method for connecting members together and connection structure

Examples

Experimental program
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Effect test

embodiment 1

of Method for Connecting Members Together and Connection Structure

[0041]FIGS. 1 and 2 are sequential flow diagrams illustrating Embodiment 1 of a method for connecting members together of the present invention.

[0042]First, two fiber reinforced resin members 3, which are members to be connected together, are prepared. Each fiber reinforced resin member 3 contains a matrix resin, which is a thermoplastic resin 1, and also contains a fiber material 2, which is adapted to reinforce the member and serves as a heating element that can generate heat from heat provided thereto, in the thermoplastic resin 1.

[0043]It should be noted that the shape of the fiber reinforced resin member 3 may be, in addition to a planar shape shown in the drawing, a variety of shapes and configurations including a three-dimensional shape (i.e., a curved shape, a wavy shape, or a unitary shape of curves and planes).

[0044]Herein, for the thermoplastic resin 1, it is possible to use one of crystalline plastic such ...

embodiment 2

of Method for Connecting Members Together and Connection Structure

[0056]FIGS. 3 to 5 are sequential flow diagrams illustrating Embodiment 2 of a method for connecting members together of the present invention.

[0057]The connection method shown herein is a method that is suitable for a case where the fiber reinforced resin members 3, which are members to be connected together, have relatively large dimensions.

[0058]When the fiber reinforced resin members 3, which are members to be connected together, have relatively large dimensions, the fiber reinforced resin members 3,3 often have no mutually-complementary warps or deformations. When the two materials are attempted to be connected together with such warps or deformations left, it would be impossible to form a position of superposition with high accuracy, and consequently, it becomes impossible to form a connection structure having about the same level of connection strength over the entire range of the position of superposition.

[005...

examples 1 and 2

[0066]Each of test pieces in accordance with Examples 1 and 2 is obtained by welding two sheet materials together through induction heating. An electromagnetic induction oscillator (UH 2.5K) of SEIDENSHA ELECTRONICS CO., LTD. was used, and an oscillation coil in spiral form was used.

[0067]A test piece was produced by placing a PBT plate with a predetermined thickness to provide a gap on the oscillation coil, and disposing the sheet materials at a position of superposition on the plate, and further applying pressure thereto from above using a metal bar for 60 seconds, and then releasing the pressure. Examples 1 and 2 differ in the gap (i.e., gap from the coil) and the current value as shown in Table 1.

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Abstract

Provided are a method for connecting members together that can easily form a connection structure, which has about the same high level of connection strength over the entire range of a position of superposition, in a short time, and a connection structure. The method is a method for connecting two or more members together, at least one of which is a fiber reinforced resin member containing a thermoplastic resin and also containing a reinforcing fiber material that serves as a heating element in the thermoplastic resin, at a position of superposition. The method includes pressing the members against each other while heating the members at a position of superposition using one of induction heating or dielectric heating and thus melting the thermoplastic resin with heat generated from the fiber material that serves as the heating element, thereby connecting the members together.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for connecting two or more members together at a position of superposition, and a connection structure. In particular, the present invention relates to a method for connecting members together, at least one of the members for forming the position of superposition being a fiber reinforced resin member containing a matrix resin and also containing a reinforcing fiber material in the matrix resin, and a connection structure of members formed by such a method.BACKGROUND ART[0002]A fiber reinforced resin member (i.e., fiber reinforced plastic (FRP)) that contains a resin and also contains a reinforcing fiber material in the resin is used in various industrial fields, such as an automobile industry, construction industry, and airline industry, by virtue of its lightweight and high strength.[0003]For connection of fiber reinforced resin members together, a connection method using an adhesive, a connection method using a bolt, a...

Claims

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Application Information

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IPC IPC(8): B29C65/36B29C65/04B29C65/60
CPCB29C65/36B29C65/601B29C65/04B29K2307/04B29K2105/253B29K2105/06B29K2077/00B29C65/3616B29C65/3676B29C65/564B29C65/602B29C66/1122B29C66/1162B29C66/43B29C66/83221B29C65/3684B29C66/7212B29C66/72143B29C66/73921B29C65/7437B29C65/72B29C66/7392B29C65/3604B29C65/08B29C65/4835B29C65/8215B29C65/8223B29C66/028B29C66/21B29C66/301B29C66/71B29C66/735B29C66/7352B29C66/73771B29C66/73775B29C66/742B29C66/919B29C66/949B29C66/72141B29C66/721B29C66/73143Y10T403/477B29C66/8244B29K2309/02B29K2305/00B29K2023/12B29K2025/06B29K2027/06B29K2023/06B29K2059/00B29K2067/003B29K2033/12B29K2055/02B29K2063/00B29K2023/04B29K2023/10B29K2025/04
Inventor URAYAMA, HIROSHI
Owner TOYOTA JIDOSHA KK
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